Grinding machine



Dec. 25, 1934. A TURNER 1,985,433

GRINDING MACHINE Filed may e, 1931 2 sheets-sheet 1 Patented Dec-.25, 1934 l I e UNITED` STATES PATENT oEEIcE GRINDING MACHmE.

Albert Turner, Shrewsbury, Mass., assignor to Cincinnati Grinders Incorporated, Cincinnati, Ohio, a corporation of Ohio Application May s, i931, seriarNo. 535,440

' c claims. (ci. s1,1os)

This invention relates to improvements in ma- The bed 10 is further providedv with ways' 16 chine tool structures and especially to improvefor the slide 17 which bears at its front end a ments in centerless grinders. work-rest block'18 for work rest blade 19. The

An object of the present invention'is the prowork rest block 18 is cut away intermediate its vision of improved means for controlling the rolateral sides, asat 81, providing ends 82 and 83 5 tation and feed o f a work piece. of a width substantially equal to the Width of Another object' of the invention is the provi- -the block 18 through which ends clamp screws sion of a Work control mechanism capable of 84 and 35 extend for clamping thev blade 19 in universal adjustment to change the rate of feed adjusted positions relative-to the block 18. The

of the work and relative position of the surfaces work rest blade has an inclined or angle top in`- 10 of the throat forming members. clining downwardly toward the active face of A further object of the invention is thev procontrol belt or band 43 and forming therewith vision of an improved self-contained unit for a workreceiving trough. The slide 17 is further use with a centerless grinder to eiect the properv provided with ways 20 for a second or upperslide l l5 controlling movement of-a work piece being op- 21 which supports the work rotat on and con- 1 5 erated upon. trolling mechanism. This mechanism includes A still further and specic object of the in' a motor 22 driving through a pair of bevel gears vention is the provision of an improved work 23 a worm 24 journaled in a bracket 25. The control member in the nature of an endless band motor 22 and bracket 25 are secured to a plate 20 for controlling the rotation and feed of a work 26 mounted on the slide-21 for movement longi- 20 `piece through the throat of a centerless grinder. tudinally thereof. To effect this movement the These and other objects are obtained by the slide 2l has extending from it a lug 27 in which means described herein and disclosed in -the is rotatably journaled a screw 28 which has its accompanying drawings forming a part thereof, threaded end threadedly received in a lug 29 and it is to be understood that any modifications extending from the plate 26. The worm 24 25 may be made in the specific structural details meshes with and drives a worm wheel 30 fast on Athere shown and 'described without departing shaft 31 which is journaled in the bracket 25. from the spirit of the .invention as defined by Secured to the shaft 31 exteriorly of the bracket the subtended claims. l 25 is a cone pulley 32 having a plurality of dif- 30 vIn the drawings; ferent sized individual pulleys each provided 30 Figure 1 is an elevational view of a centerless with a groove for the reception of a complegrinder embodying the improvements o f this inmentary formed belt 33 which is adapted to be vention." O trained about a cone pulley 34. The transmis- Figure 2 is a plan view ofthe grinder shown sion member 33 may be a belt, band, chain, or 35 in Figure 1. the like, here shown as a belt having a V shaped 35 Figure 3 is a fragmentary sectional view on' cross section. By this construction engagement line 3-3 of Figure 2. between the belt and pulleys is insured through Figure 4 is a sectional view taken on line 4--4 the contact of the inclined sides of the belt and of Figure 3. the wedge shaped sides of the pulley groove.

Figure 5 is a sectional View taken on line 5-5 The cone pulley 34 is keyed to a shaft 35 jour- 40 of Figure 3.- naled in anti-friction bearings 36 and 37 carried Figure is a cross sectional view of the control by the upper end of yoke arms 38 and 39. A nut band or belt. 40 on the end of the shaft 35 clamps the'parts Throughout the several views of the drawings between itself and a head 41 on the shaft 35. 45 similar reference characters are employed to de- Intermediate the yoke arms 38 and 39 the shaft 45 note the same or similar parts. 35 has keyed to it a drum 42 about which an end- The machine of this invention may comprise less band or belt 43 extends. The yoke arms 38 a base or bed 10 having formed thereon and exand 39 are secured by bolts 44 to a block or antending therefrom -a pedestal 11 for supporting vil 45, and the said arms 38 and 39 extend below the bearings of a spindle to which is secured the the anvil 45 and carry anti-friction bearings 46 grinding wheel 12. Thegrinding wheel 12 is and 47 at-their lower extremities. Journaled in enclosed within a vsuitable housing 13' having the bearings 46 and 47 is a shaft 48 having a formed integral therewith a bracket 14 for the head 49 on one end and a lock nut 50 on the truing mechanism 15 utilized for trimming lor other. Intermediate the lower ends of the yoke trulng the active face of the grinding wheel. arms 38 and 39 and keyed to the shaft 48 is a drum 51 about which* the endless belt 43 is furupon which of the steps `of 32 and 34 are beingemployed, for correspondingly driving the endless belt or band 43. This belt 43 is driven ina clockwise direction so that its surface adjacent the work rest blade travels inA an upwardly direction while in engagement with the work 52 for rotating the work in a counter-clockwise direction. The active. face of the grinding wheel 12 travels in a clockwise direction and tends to forcel the work down against the blade. Therefore, the blade'19 takes the cut thrust of the 'grinding wheel while the infeecl/ thrust of `the wheel is against the anvil 45.

The anvil 45 has extending therefrom arms 54 and 55 which are joined to form flange 56 from which stud or trunnion 57 extends. The stud 57 is journaled in a bracket 58 which has depending from it a bearing 59 provided with a bore 60 for bushing 61. The bearing l59 is received between arms 62 .and 63 of a bracket 64 secured on the extension 65 of slide .21. The arms 62 and 63 are provided with bores in axial alignment with the bore of bushing 61 through which a stud or shaft 66 projects. The stud 66 has a head 67 on one end and a nut 68 on the other for clamping the bearing 59, of the bracket 58 therebetween to hold the anvil 45 in adjusted positions about the axis of said clamping stud or bolt 66. 'I'his adjustment of the parts is employed to properly enlarge the grinding throat above the actual point of grinding. In-order to provide the necessary feeding component on the `work to feed same through the grinding throat, as when performing through feed grinding operations, the band or belt 43 and anvil 45 are adjusted about the axis of stud or trunion 57. The said parts are.

lbetween the axesl of shafts 35 and 31v thereby throwing undue tension on the belt 33 or loosening same-beyond Vits elcient driving tension.v For this reason the motor and bracket 25 are mounted on the plate 26,so Vthat through theadjusting screw 28 the said parts may be either advanced `or retarded relative to the slide 21 for properly tensioning belt 33. ,I

In order that. the proper frictional engagement may be had between the belt 43 and the work 52,

the said belt may be serrated as shown at 71 in Figure 6. This serration or roughening`71 may hefobta'ined from the grinding wheel 12 which would-be trued to an opemcondition whereby a multiplicity `of relatively deep cutting points are provided each forming a groove in the band or belt 43 between which grooves teeth would-appear so that the active face of band 43 would appear similarto the surface of v a butchers knife-sharpening steel. In order to cross the grooves formed by the grinding wheel the spindle thereof ispro-v videdwith areciprocating attachment 86.'

The slides 17-and 21 are adapted to be actuated relative to the bed'10 for setting up the parts ing wheel 12 and band or belt 43. For this purpose an adjusting screw 72 is provided having threaded engagement with a nut 73 oscillatably journaled in the slide 21 but prevented from axial movement relative thereto by the nuts 74 and 75. The outer end of the adjusting screw 72 is journaled in a bracket 76 carried by the bed 10, and the said screw hassecured to it exteriorly of the bracket 76 a pilot wheel 77 whereby the said screw may be actuated. In order that the slides 17- and 21 may be moved as a unit, there is. provided clamps 78 for securing the slides to one another, while to adjust the slides independently of one another clamps 79 are employed for clamping the lower slide 17 to the bed.

Inthe performance of centerless grinding operations on shoulder work, which is generally termed infeed grinding, the throat is enlarged to permit the placement of the work on the blade whereupon the throatis contracted to reduce the work to the desired size. For this purpose the oscillatable mit 73 has secured to it a handle or lever 80 foil oscillating the same, which oscillation causes .the nut to advance or retract relative to the screw 72 and thereby actuate the parts correspondingly.. In practice the hand lever 80 is oscillated through an arc of ninety degrees from the position shown in Figures 1 vancl 2. By previous adjustment of the slides 17 and 211the oscillation of the lever 80 causes the work control unit to feed the work into the grinding wheel an amount. necessary to reduce the work to the desired size.

What is claimed is:

l. In a precision centerless grinder the combination of a bed, a grinding element having a non-yielding operative surface rotatably mounted thereon, a work rest blade adjacent the operative face of the grinding wheel for supporting a work piece while in engagement with'the grinding A wheel, a slide carried by the bed for supporting the work rest blade, a second slide superimposed 'on the first slide for movement relative thereto, a bracket mounted on the second slide, a trunnion bearing pivotally secured to the bracket for adjustment in a plane tandem to the' plane of rotation of themen-yielding face of the grinding wheel, a drum frame having a trunnion extend-f ing therefrom and received in the trunnion bearing for'adjustment in a planetransversely to the plane of adjustment of the trunnion bearing, an endless band supported by the drum frame, means integral with the drum frame for backing up the'band at a point opposite the grinding l point of the grinding wheel and thereby forming "a grinding throat between the operative nonyielding portions of the grinding Wheel and band,

-means"for actuating the"band at aicomparatively slow work rotation rate of speed, said band having a serrated operative surface forincreasing the frictional contact between itself and the work, means for securing the slides to one another for unitary adjustment, means for securing the rst slide to the' bed for independent'adjustment of the slides, and an adjusting screw for effecting the unitary and independent adjustment of the I' slides to properly position the work rest blade reland to vary the final size of the grinding throat -betweenfthe non-yielding operative portions off the grinding wheel and band.

2. In a precision centerless grinder the com? bination of a bed, a grinding element having a non-yielding operative surface rotatably mounted thereon, a work rest blade adjacent theoperative face of the grinding wheel for vsupporting 'a work piece while in engagement with the grindimposed on the rst slide for movement relative thereto, a bracket mounted on the second slide, a trunnion bearing pivotally secured to the bracket for adjustment in a plane tandem to the plane of rotation of the non-yielding face of the grinding wheel, a drum frame having a trunnion eX- tending therefrom and received in the trunnion bearing for adjustment in a plane transversely to the plane of adjustment of the trunnion bearing, an endless band supported by the drum frame, means integral with the drum frame for backing up the band at a point opposite the grinding point of the grinding wheel and thereby forming a grinding throat between the operative nonyielding portions of the grinding Wheel and band, means for actuating the band at a comparatively slow work rotation rate of speed, said band having a serrated operative surface for increasing the frictional contact between itself and the work, means for securing the slides to one another for unitary adjustment, means for securing the rst slide to the bed.for independent adjustment of the slides, an adjusting screw for eiecting the unitary and independent adjustment of the slides to properly position the work rest blade relative to the active face of the grinding wheel and to vary the nal size of the grinding throat between the non-yielding operative portions of the grinding wheel and band, a prime mover carried by the second slide for adjustment relative there-l to for actuating the band, and means between the prime mover and the band for reducing the rate of vactuation of the band as respects the prime mover.

3. In a precision centerless grinder of the class described the combination of"a bed, a pair of l opposed grinding and work rotation controlling ing throat.

4. In a precision centerless grinder of the class described the combination of a bed, a grinding wheel rotatably mounted thereon, an opposed work rotation controlling mechanism including an endless band, the grinding wheel and endless band being spaced from one another a distance to form a grinding throat between them, said band being formed of non-compressible material and having a serrated operative surface for frictional engagement with the work, a work rest blade disposed within the grinding throat for peripherally supporting a work piec'e while in contact with the grinding wheel and band, a bracket member including a pair of drums for supporting the band, and an anvil operatively associated with the supporting bracket for backing up the band at the point of contact thereof with the work for thereby providing a grinding throat of a definite size which is non-yielding during the grinding operation.

5. In a precision centerless grinder 'of the class described the combinationof a bed, a grinding wheel rotatably mounted thereon, an opposed work rotation controlling mechanism including an endless band, the grinding wheel and endless band being spaced from one another a distance to f orm a grinding throat between them, said band being formed of non-compressible material and having a serrated operative surface for frictional engagement with the work, a work rest blade disposed within the grinding throat for peripherally supporting a work piece while in contact with the grinding wheel and band, a bracket member including a pair of drums for supporting the band, an anvil operatively associated with the supporting bracket for backing up the band atthe point of contact thereof with the work for thereby providing a grinding throat of a denite size, which is non-yielding during the grinding operation, a slide member mounted on the bed for 'supporting the work controlling mechanism, and means associated with the bed and slide for adjusting the position of the band with respect to the grinding Wheel to vary the size of the grinding throat.

v 6. In a precision centerless grinder of the class described the combination of a bed, a grinding wheel rotatably mounted' thereon, an opposed work rotation controlling mechanism including anendless band, the grinding wheel and endless band being spaced from one another a distance to form a grinding throat between them, said band being formed of non-compressible material and havinga serrated operative surface for frictional engagement 'with the work, a Work rest blade disposed within the grinding throat for peripherally supporting a work piece While in contact with the grinding wheel and band, a bracket member including a pair of drums for supporting the band, an anvil operatively associated with the supporting bracket for backing up the band atv the point of contact thereof with the work for thereby providing a grinding throat of a denite I size which is non-yielding during the grinding operation, a slide member mounted on the bed for supporting the work controlling mechanism, means associated with the bed and slide for adjusting the position of the band with respect to the grinding-wheel to vary the size of the grinding throat,.and means carried bythe slide for driving the band.

ALBERT TURNER. 

